Pressure-fed tool.



G. 11. GILMAN.

PRESSURE FED TOOL.

APPLICATION FILED MAB. 2, 1908.

Patented Aug. 15, 1911.

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L a w m GEORGE H. GILMAN', OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, OF CLAREMONT, NEW HAMPSHIRE, A CORPORATION OF Originalapplication filed February 2, 1907 Serial No. 355,493. Divided and this application filed March 2,

' 1908. Serial No. 418,727.

To all whom it may concern:

Be it known that I, GEORGE GILMAN, a citizen of the United States, residing at Claremont, in the county of Sullivan, State of New Hampshire, have invented an Improvement in Pressure-Fed Tools, of which the following description, in connection with the accompanying drawings, is a specification, like letters'on the drawings representing like parts. -This invention relates to pressure f e tools, being more particularly concerned with the provision of means for rendering the pressure feeding devices of such tools.

practical and effective. 1 This application is a division of my prio co-pending application, Serial No. 355,493,

filed February 2, 1907.

My invention will be best-understood by reference to the following description when taken in connection with the accompanying illustration of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

In the drawings :Figure 1 represents in fragmentary sectional elevation a tool appliance to which is applied one form of my invention; Fig. 2 represents in side elevation, on a smaller scale, the tool appliance shown in Fig. l; and Fig. 3 is the transverse section taken through the expanding ring in Fig. 1 and on an enlarged scale.

Referring to the drawings and to the embodiment of my invention there shown, I have illustrated the principles thereof by showing its application to a pneumatic hammer drill of ordinary and usual construction.

The details of the drill are not shown, it being suflicient to say that in the apparatus described the cutting tool 2is held in a suitable chuck at the end of the drill tool cylinder 1, and is struck a series of rapidly reoccurring blows by a reciprocatory piston (not shown) within the drill tool' cylinder, all of which is well'understood by those skilled in the art.

Associated with the drill tool I have shown pressure fluid feeding means for I to the head 40f the drill tool and the opposite end provided with a packed aperture through whichprojects thepiston rod 5, carrying at its end the pointed foot 6 adapted to be braced against a vertical side wall of a mine or quarry, in which the apparatus is used. Within the-cylinder the piston rod is secured to the piston 7, so that when air is admitted to the cylinderibetween the piston and the forward cylinder head or that next adjacent the drill tool, the cylinder with its attached head is pressed forwardly in much the same fashion as if the hammer drill were pressedforward against the work by the hand of the operator. v

For controlling the admission of pressure fluid not only to the feeding cylinder but also to the. tool itself, there is provided a rotatable sleeve 8 which is mounted upon a Specification of Letters Patent. Patented dugr 15, 1911. I l

is threaded the end of the feeding cylinder 3,

so that the latter and the cylinder head. block 10, the latter closing the end of the cylinder, are seated against and fixedly held w by the walls of-the drill head.

To retain the sleeve v8 longitudinally in position there is provided the split clamping collar 11, which is clamped about the necked-, down end of the reduced head portion 9. In

order that this clamp may also assist in securing the cylinder end more firmly, the interiorly threaded "necked-down portion of the head portion is preferably provided with two or more longitudinal slits (not shown) so that when the clamping collar is set up tight it also clamps the head and the cylinder into firm threaded engagement with each other.

Pressure 'fluid is supplied jointly from any suitable source (not shown) to the feeding cylinder and the tool by the pipe 12, which latter has a threaded nipple connected to. the admission opening 13 at the side of the cylinder near its attachment tothe drill tool. Communicating with the admission opening 13 is the main supply port 14; which extends longitudinally forward through the cylinder head block 10 and the tool head to the valve chamber 15, in which latter is arranged the throttle valve 16 of the piston type controlled by the rotatable sleeve 8. Opening out of the valve chamber are two passages 17 and 18, theformer being arranged parallel with the admission port 14 'and leading back to the pressure space 19 within the feeding cylinder. The second and shorterpassagelB leads from the valve chamber in the opposite direction to the pressure'space 20 of the drill tool where it is supplied to the tool cylinder through the vcontrol of a suitable differential or other valve (not shown) of any usual or suitable construction. a

As is more fully set forth in my aforesaid prior copending application, through means of the rotatable sleeve 8, the throttle valve 16 may be moved to control both the feedin pressure fluid and the tool pressure flui this being accomplished in the present instance'by successive ste s. Thevalve in one position connects the ceding cylinder passage 17 with the atmosphere through the vent opening 21 opening outwardly' from the valve chamber 15, so that no pressure is maintained in the feeding space of the feeding cylinder. In the second position the valve cuts off the feeding cylinder passage from communication with the vent opening and opens the same to the live pressure fluid passage 14,-this acting to press the drillagainst the work. Further movement of the valve, while maintaining the pressure fluid supply to the feeding cylinder space, also admits the same in greater or less amount to the drill port 18 to operatethe tool.

While the piston may he of any desired construction in order to better prevent leak age from the pressure cylinder, the piston, in the apparatus shown, has a reduced end 22' (Fig. 1)- on which thereis provided a sleeve 23. The inner end of said sleeve has formed thereon a shoulder adapted to re ceive a packing ring 24, which latter, there.- fore, rests between the shoulder and the enlarged portion of the iston 7 Beyond the sleeve 23 there is a so provided another shouldered sleeve carrying a second packing ring 26. On an outer shoulder of the sleeve 25 is arranged a split expanding ring.-

27 and this, together with the sleeve 23, is retained in lace by the feediston-nut 28 secured to t e threaded end o the reduced piston portion 32. The reduced piston portion is provided with an axial passage 29 extending part way into the same and open ing into the ressure space 19, radial passages 3'0 alimn with the iston ring 24 and other radia passages, 3 alining with the piston ring 26 being extended from the axial passage through the piston and. the res ective sleeves,- so as to admit pressure flu1d constantly to the inside of the piston .rings. So long, therefore, as feeding pressure fluid is admitted to the pressure space, it also acts to expand the rings and better to prevent leakage-IA. tapered plug 32 is threaded into the 'end'of said piston and the latter is split at 33, so that the plug expands the piston end within the threaded nut ,28 and prevents any .loosening of the parts. 'lhe plug is provided with an axial passage 34, which places the piston passage 29 in communication with the'pressurespace 19. The inner end of the feedlng cylinder is enlarged slightly at 35 where its walls engage the ring'27 in the contracted condition of the piston, so that the expansion of the ring tends to retain the piston normally in that position, rendering it more convenient.

for purposes of transportation or handling. The enlarged portion of the cylinder, however, is beveled at 36 and the end of the ring is also rounded at 37, so that pressure fluid when admitted will readily forcethe piston outward by forcing the ring to contract and ride over the beveled walL; This construction constitutes a convenient retention device for retaining the apparatus in its contracted condition. I 7

While I have shown and described in detail one form of my invention it is to be understood that the same is not'to be limited to the particular detail or form or-relation of parts shown, but that extensive modifications may be made therein without departing from the spirit of my invention.

Claims.

' 1. -lhe combination with apressure fluid.

tool of extensible pressure fluid feeding means there'for com'prising a feeding cylinder, with its cooperating piston, and means normally to retain said apparatus in its contracted condition, said means being releasable by the admission of feeding pressure fluid 'to the feeding cylinder.

2. The combination with a pressure fluid tool of a feeding cylinder therefor, a cosition of the piston.

4. The comblnatlon with a pressure fluid tool of extensible pressure fluid feeding operating piston and means normally maintaining the piston at one end of the cylin-.

means therefor, comprising a. feeding cyl inder with its cooperating piston, and yieldable means normally to retain said apparatus in its contracted condition but auto* -matically permitting the extension of said feeding means through application of force" to the piston.

5. The combination with a pressure fluid tool of extensible pressure fluid feeding means therefor, comprising a feeding cylinder with its cooperating piston, and an expansion ring carried by said piston, said cylinder being provided with a suitable enlargement to engage with said expansion ring whenthe feeding apparatus is in its contracted condition.

6. The combination with a pressure fluid tool of extensible feeding means therefor, comprising a feed cylinder with its cooperative piston, said piston and cylinder being provided one part with an expansible member and the other part' with acooperating depression adapted to be engaged by said expansible member toretain the apparatus in-its--mntracted condition, said piston and -cylinder being automatically releasable when the apparatus is in use to permit extension of the feeding means.

7 The combination with a pressure-fluid tool of expansible pressure feeding means therefor comprising a feeding cylinder member with its cooperating pistonmember contained within the cylinder, a yieldable part on one member having a beveled edge and said other member having a cotiperating depression engageable with the yielding part when the apparatus is contracted and in a condition for disuse, said beveled edge permitting the enforced disengagement 0 said parts.

8. In a pressure fluid tool, extensible pressure fluid feeding means including a feeding cylinder having an enlarged portion in l the cylinder walls, a cooperating piston, a

split expanding ring carried by said piston and adapted to engage said enlarged portion to retain the piston in contracted position, the engaging walls of the ring and cylinder beingfashioned to cause the ring to yield and permit extensionof the piston within the cylinder on application of fluid pressure to the iston.

9. T e combination'with a pressure-fluid tool 1, of a feeding c linder 3, the piston 7 the expanding ring 2;, and the enlar ement 35 in the interior of the cylinder ceiving the ring when expanded.

10. The combination with a pressure fluid tool of expansible fluid'feeding means therefor, comprising a feeding cylinder with its cotiperatlng plston, said piston and cylin-1 der being) provided one part -with a yielding mem er and the other part with a cooperating member having a depression a apted to be engaged by the said yielding member to retainthe apparatus in its conv tracted osition, said members having a beveled ormation to permit automatic release of the piston under fluid pressure.

. In testimony whereof, I have signed my name to this specification, in the presence of twot'subscribing witnesses.

ALEXANDER HIoKs, E. J. 

